The committee of 3 elders that is appointed to help the DA one is a very different procedure to the committee that is involved in a JC.
In the case of the DA if the person writes a letter to DA himself then the the 3 elders chat to him to see why and if the elders cannot change his mind then an announcement is made to the congregation.
A JC involves investigation into an alleged wrongdoing and talking to the accused.
That being said, in the taking of blood, which according to the new Elders manual is likened to one DA himself it advises:
"Willingly and unrepentantly taking blood. If someone willingly takes blood, perhaps because of being under extreme pressure, the committee should obtain the facts and determine the individual's attitude. If he is repentant the committee would provide spiritual assistance in the spirit of Galatians 6: 1 and Jude 22, 23.
Since he is spiritually weak, he would not qualify for special privileges for a period of time, and it may be necessary to remove certain basic privileges.
Depending on the circumstances, the committee also need to arrange for an announcement to the congregation: "'The elders have handled a matter having to do with [name of person]. You will be glad to know that spiritual shepherds are endeavoring to render assistance."
On the other hand, if the elders on the committee determine that he is unrepentant, they should announce his disassociation."